network: adjust dbus interface

- remove global switch properties

- remove DeviceStateChagned signal

- add IsDefaultExpandedSection()

- add autoConnet argument in NeedSecrets() and FeedSecret()

tower: https://tower.im/projects/8f19f0bf0e754f0b82ef2c24bc230973/todos/38d3c99fb18440848fe754424c0dd4b9/
tower: https://tower.im/projects/8f19f0bf0e754f0b82ef2c24bc230973/todos/c0d9158bdbb04f08a355e7e1ccfd4dce/
Change-Id: I933fdb94634fd2e4d6dca9afab316e7279b50b52